#include <iostream>
#include "Sales_item.h"  //引入包含Sales_item类的头文件
int main()
{
    Sales_item book;   //定义book为Sales_item类的实例化对象
    std::cin >> book;   //读取对象，读编号，数量，单价
    std::cout << book << std::endl; //读出对象。写出编号，数量，合计价，单价
    return 0;
}
